[4] [4] XIE H, CHENG Y J, DING Y R, et al. A high-efficiency 28 GHz/39 GHz dual-band power amplifier MMIC for 5G communication ［J］. IEEE Microwave and Wireless Components Letters, 2021, 31(11): 1227-1230.

[6] [6] ZHOU H, PEREZ-CISNEROS J R, LANGBORN B, et al. Design of a compact GaN power amplifier with high efficiency and beyond decade bandwidth ［J］. IEEE Microwave and Wireless Components Letters, 2022, 32(12): 1439-1442.

[7] [7] SOKAL N O, SOKAL A D. Class E - a new class of high-efficiency tuned single-ended switching power amplifiers ［J］. IEEE Journal of Solid-State Circuits, 1975, 10(3): 168-176.

[8] [8] GREBENNIKOV A. Switched-mode RF and microwave parallel-circuit class E power amplifiers ［J］. International Journal of RF and Microwave Computer-Aided Engineering, 2004, 14(1): 21-35.

[9] [9] ZHANG Z, CHENG Z, KE H, et al. Design of a broadband high-efficiency hybrid class-EFJ power amplifier ［J］. IEEE Microwave and Wireless Components Letters, 2020, 30(4): 407-409.

[10] [10] LIU C, CHENG Q F. Analysis and design of high-efficiency parallel-circuit class-E/F power amplifier ［J］. IEEE Transactions on Microwave Theory and Techniques, 2019, 67(6): 2382-2392.

[11] [11] CHEN P, YANG K, ZHANG T. Analysis of a class-E power amplifier with shunt filter for any duty ratio ［J］. IEEE Transactions on Circuits and Systems II: Express Briefs, 2017, 64(8): 857-861.

[12] [12] SAFARI MUGISHO M, MAKAROV D G, RASSOKHINA Y V, et al. Generalized class-E power amplifier with shunt capacitance and shunt filter ［J］. IEEE Transactions on Microwave Theory and Techniques, 2019, 67(8): 3464-3474.

[13] [13] SHEIKHI A, THIAN M, VAFAEE M. Broadband parallel-circuit class-E amplifier with second harmonic control circuit ［J］. IEEE Transactions on Circuits and Systems II: Express Briefs, 2019, 66(6): 928-932.

[14] [14] GREBENNIKOV A. high-efficiency class-E power amplifier with shunt capacitance and shunt filter ［J］. IEEE Transactions on Circuits and Systems I: Regular Papers, 2016, 63(1): 12-22.

[16] [16] CUMANA J, GREBENNIKOV A, SUN G, et al. An extended topology of parallel-circuit class-E power amplifier to account for larger output capacitances ［J］. IEEE Transactions on Microwave Theory and Techniques, 2011, 59(12): 3174-3183.

[19] [19] THIAN M, FUSCO V F. Analysis and design of class-E3F and transmission-line class-E3F2 power amplifiers ［J］. IEEE Transactions on Circuits and Systems I: Regular Papers, 2011, 58(5): 902-912.

[20] [20] CAI Q, CHE W, MA K, et al. A compact Ku-band broadband GaAs power amplifier using an improved darlington power stage ［J］. IEEE Transactions on Microwave Theory and Techniques, 2020, 68(7): 3068-3078.

[21] [21] LV G, CHEN W, LIU X, et al. A fully integrated C-band GaN MMIC Doherty power amplifier with high efficiency and compact size for 5G application ［J］. IEEE Access, 2019, 7: 71665-71674.

[22] [22] CHENG P, WANG Q, LI W, et al. A broadband asymmetrical GaN MMIC Doherty power amplifier with compact size for 5G communications ［J］. Electronics, 2021, 10(3): 311.

[23] [23] LI S H, HSU S S H, ZHANG J, et al. Design of a compact GaN MMIC Doherty power amplifier and system level analysis with X-parameters for 5G communications ［J］. IEEE Transactions on Microwave Theory and Techniques, 2018, 66(12): 5676-5684.

[24] [24] LV G, CHEN W, CHEN L, et al. A fully integrated C-band GaN MMIC Doherty power amplifier with high gain and high efficiency for 5G application ［C］ // 2019 IEEE MTT-S International Microwave Symposium (IMS). Boston, MA, USA. 2019: 560-563.